3 examples of 'create empty numpy array and append' in Python

12
def create_array():
13
    """Creates a simple 3D numpy array with unique values at each
14
    location in the matrix.
15
16
    """
17
    rows, cols, depth = 2, 3, 4
18
    arr = numpy.zeros((rows, cols, depth), 'i')
19
    count = 0
20
    for i in range(rows):
21
        for j in range(cols):
22
            for k in range(depth):
23
                arr[i,j,k] = count
24
                count += 1
25
    return arr

11
def create_empty_arrays():
12
	oneD_empty = np.empty(5)
13
	twoD_empty = np.empty((5,4))
14
	threeD_empty = np.empty((5,4,3))
15
16
	print('1D array')
17
	print(oneD_empty)
18
19
	print('2D array')
20
	print(twoD_empty)
21
22
	print('3D array')
23
	print(threeD_empty)

138
def _populate_array(data_list, array_type):
139
    length = len(data_list)
140
    data_array = array_type(length)
141
    for i in range(0, length):
142
        data_array[i] = data_list[i]
143
    return data_array